local shader = love.graphics.newShader(nil, [[
    float sdRing(vec2 p, float r) {
        return abs(length(p) - r);
    }
    vec4 effect( vec4 color, Image tex, vec2 uv, vec2 pos )
    {
        float d = sdRing(pos / 48.0 - 0.5, 0.4);
        float c = smoothstep(0.05, 0.0, d);
        return vec4(1.0, 1.0, 1.0, c);
        //return vec4(0.0, 0.0, 0.0, 1.0);
    }
]])
ImageMaker:make("ring48", 48, 48, shader)